Uplinking downsampled signals from cellular base stations to...

H - Electricity – 04 – Q

Patent

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Details

H04Q 7/30 (2006.01)

Patent

CA 2332778

Cellular radiotelephone communication systems and methods downlink digital coded speech from a cellular radio exchange to a cellular radiotelephone base station and uplink downsampled (i.e. undersampled relative to the Nyquist rate of two samples per symbol) radiotelephone signals from the cellular radiotelephone base station to the cellular radio exchange. The downsampled radiotelephone signals are demodulated at the cellular radio exchange and the digital coded speech is modulated at the cellular radiotelephone base station. Diversity demodulation may be used at the cellular radio exchange, to diversity demodulate the downsampled radiotelephone signals at the cellular radio exchange. By downlinking digital coded speech from the cellular radio exchange to the cellular radiotelephone base station, and uplinking downsampled radiotelephone signals from the cellular radiotelephone base station to the cellular radio exchange, narrowband uplinks and downlinks may be provided between the base stations and the cellular radio exchange, to thereby reduce cost. Moreover, since demodulation takes place at tlu cellular radio exchange rather than at the base stations, low cost base stations may be provided. However, since downsampled radiotelephone signals are transmitted from the base stations to the cellular radio exchange, diversity demodulation may be performed at the cellular radio exchange, to thereby improve the voice quality of the cellular radiotelephone communications.

L'invention se rapporte à des systèmes de communication radiotéléphoniques cellulaires et à des procédés associés qui assurent la transmission descendante de parole codée sous forme numérique depuis un central de transmission radio cellulaire vers une station de base radiotéléphonique cellulaire, ainsi que la transmission montante de signaux radiotéléphoniques sous-échantillonnés (c'est à dire échantillonnés par rapport à la fréquence de Nyquist de deux échantillons par symbole), depuis la station de base radiotéléphonique cellulaire vers le central de transmission radio cellulaire. Grâce à la transmission par liaison descendante de la parole codée sous forme numérique du central de transmission radio cellulaire vers la station de base radiotéléphonique cellulaire et à la transmission par liaison montante de signaux radiotéléphoniques sous-échantillonnés depuis la station de base radiotéléphonique cellulaire vers le central de transmission radio cellulaire, des liaisons montantes et descendante à bande étroite peuvent être utilisées entre les stations de base et le central de transmission radio cellulaire, ce qui permet de réduire les coûts. De plus, étant donné que la démodulation est effectuée au niveau du central de transmission radio cellulaire plutôt qu'au niveau des stations de base, il est possible d'utiliser des stations de base peu onéreuses. Néanmoins, du fait que les signaux radiotéléphoniques sous-échantillonnés sont émis par les stations de base à destination du central de transmission radio cellulaire, ce qui permet d'obtenir une meilleure qualité des signaux vocaux des transmissions radiotéléphoniques cellulaires.

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